Tables with the performances of some electrostatic machines, as in the
catalog from E. Leybold's Nachfolger A.-G., 1927.

Wimshurst machines:

Disk diameter (cm):  18    21      26      31      36      41       46
Spark length (cm):  5-6  8-10 10-12.5 12.5-15 15-17.5 17.5-20  20-22.5

Wommelsdorf machines:

Disk diameter (cm):       26      35      45      55
Spark length (cm):     17-19   21-25   26-30   30-35
Output current (uA): 150-220 250-350 420-520 550-650
Power required (hp):    1/16     1/8     1/6     1/5

Tables with the performances of some electrostatic machines, as in the
catalog from Max Kohl A. G., 1927.

Wommelsdorf machines, motor driven:

Number of disks:           1       1       1        1       2       3       5
Disk diameter (cm):       26      35      45       55      55      55      55
Spark length (cm):     17-19   21-25   26-30    20-30   30-33   30-33   30-33
Output current (mA): 0.3-0.4 0.4-0.5 0.5-0.6 0.6-0.75 1.1-1.4 1.6-2.0 2.4-3.0
Power required (hp):     1/8     1/8     1/6      1/4     1/4     1/3     1/2

Wehrsen machines, one fixed disk and one rotating disk:

Disk diameter (cm):        36      45      55
Spark length (cm):      15-18   20-23   26-28
Output voltage (kV):        -     115     135
Output current (uA):  200-300 300-400 400-500
Power required (hp):      1/6     1/4     1/3

Wehrsen machines, one fixed disk and two rotating disks:

Disk diameter (cm):        46      55
Spark length (cm):      20-23   20-23
Output voltage (kV):      115     135
Output current (uA):  600-800 800-900
Power required (hp):      1/2     1/2

Reproduced by Antonio Carlos M. de Queiroz 
http://www.coe.ufrj.br/~acmq
28/8/97